DB Woocommerce Price Converter is an easy solution to manage the prices if you need to convert them from one currency to another.
This plugin is relying on a 3rd party service of CBR that is provided as a freeware and is documented here https://www.cbr.ru/development/sxml/ and here https://www.cbr-xml-daily.ru/
Terms of Use: https://www.cbr.ru/user_agreement/